About 145 of these army liaison and air ambulance short field aeroplanes were built by Icarus at their Zemun site, the location of Belgrade's international airport. Although no doubt inspired by the Fieseler Storch, it differed in having an all-metal cantilever wing and fuselage. A later development was the Kurir L with a Lycoming engine replacing the Walter Minor. First flown in 1955 and built from 1958-61, it was retired from Yugoslav military service in 1972. As of 2010, one Kurir was registered in the US, one in Croatia and this one in Slovenia.

Broadly equivalent to the de Havilland Chipmunk, the Aero 3 first flew in 1956 and from 1958 a total of 110 were built for the Yugoslav AF as primary trainers. They could also be employed in the army co-operation role and served until the mid-1970s when several found their way onto the civil market.